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December Weather in Fossil, United States

Last updated: June 24, 2025

In December, the average temperature in Fossil, United States is a crisp 1°C (34°F). While you might experience a chilly minimum of -13°C (9°F), it's possible to enjoy warmer days with maximum temperatures reaching 18°C (65°F). Be prepared for some damp weather, as 54 mm (2.1 in) of precipitation is expected over 13 days, and keep in mind the high average humidity of 88% that will add to the overall cool atmosphere.

December Temperature in Fossil

In December in Fossil, the average temperature is 1°C (34°F). The maximum can reach 18°C (65°F), while the minimum can drop as low as -13°C (9°F). It's advisable to pack layers and be prepared for a wide range of weather conditions when traveling during this month.

December Weather in Fossil: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fossil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fossil, December typically has an average temperature of 1°C (34°F), with highs reaching up to 18°C (65°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec333441485765747363504134
Data source: Temperature data for Fossil generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Fossil

In Fossil in December, the precipitation amount is 54 mm (2.1 in), falling over the course of 13 days.

December Precipitation Trends in Fossil

The chart displays monthly precipitation patterns in Fossil, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Fossil, December typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec5168515133171721355254
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fossil

In Fossil in December humidity is 88%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel feel damp and brisk, where every breath carries a crisp bite, and the air clings to your skin, urging you to seek warmth and comfort.

December Average Humidity in Fossil

This chart illustrates the average monthly humidity levels in Fossil, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Fossil is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%85%80%82%79%63%59%78%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fossil

In Fossil in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Fossil, you can visit Hourly UV Index in Fossil.

Maximum UV Index Levels in Fossil for December

The chart shows the monthly maximum UV Index (UVI) for Fossil in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Fossil typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101098532
Data source: Fossil December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Fossil Compares to Other Months

Weather in Fossil varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Fossil, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Fossil, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)51 mm (2.0 inches)86%low
February Weather1°C (35°F)68 mm (2.7 inches)87%moderate
March Weather5°C (41°F)51 mm (2.0 inches)86%high
April Weather9°C (48°F)51 mm (2.0 inches)85%high
May Weather14°C (57°F)33 mm (1.3 inches)80%very high
June Weather19°C (66°F)17 mm (0.7 inches)82%very high
July Weather23°C (74°F)1 mm (0.0 inches)78%very high
August Weather23°C (74°F)7 mm (0.3 inches)62%very high
September Weather17°C (63°F)21 mm (0.8 inches)59%very high
October Weather10°C (50°F)35 mm (1.4 inches)78%moderate
November Weather5°C (41°F)52 mm (2.0 inches)88%moderate
December Weather1°C (34°F)54 mm (2.1 inches)88%low

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